US4306407A - Lawn care device - Google Patents

Lawn care device Download PDF

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Publication number
US4306407A
US4306407A US05/970,681 US97068178A US4306407A US 4306407 A US4306407 A US 4306407A US 97068178 A US97068178 A US 97068178A US 4306407 A US4306407 A US 4306407A
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US
United States
Prior art keywords
support beam
tool
lawn
operative position
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/970,681
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English (en)
Inventor
Jurgen Dambroth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RUX Firma KG
Original Assignee
RUX Firma KG
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Filing date
Publication date
Priority claimed from DE19772757963 external-priority patent/DE2757963A1/de
Application filed by RUX Firma KG filed Critical RUX Firma KG
Application granted granted Critical
Publication of US4306407A publication Critical patent/US4306407A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
    • A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
    • A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
    • A01B63/102—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means characterised by the location of the mounting on the tractor, e.g. on the rear part
    • A01B63/108—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means characterised by the location of the mounting on the tractor, e.g. on the rear part on the front part

Definitions

  • the invention relates to a device for lawn care and the like. More particularly, it relates to a lawn mower attachment which essentially consists of a rotatable support beam, cutter support beam, or cutting blade which is mounted onto a vertically-disposed motor drive shaft of conventional lawn mowers and which is provided with receiving means for attaching work tools thereto.
  • Lawns require intensive care if they are to look healthy and beautiful.
  • the zone close to the ground between the grass tips and the ground must be kept free from deposits, undesirable plants, moss, etc.
  • the earth crust must be frequently scratched or cut, so that the supply of nutrients to the grass roots is assured.
  • the spring trunnions are more elastic than the aforementioned rigid sheet metal members having deflected ends, it is easier to avoid obstacles on the ground, so that damage to the drive unit is prevented but, on the other hand, they are still relatively rigid, so that they may interfere with its operation. Furthermore, these known power rakes are only suitable for clearing the ground.
  • impellers are mounted on the operating tools which pivot the operating tools into operating position when the air is pushed against the impeller during the rotation of the support beam. It is essential to shape the impeller in such a way that they act to throw out the raked or grass cuttings from the lawn. Thereby, the pressure on the impeller is increased and the operating position of the operating tool is additionally stabilized.
  • the pivoting of the operating tools into the operating position may also be accomplished due to centrifugal forces which are generated by the rotation of the support beam.
  • centrifugal forces may be advantageously put to use by the employment of special centrifugal devices, for example, centrifugal weights which are, on the one hand, coupled with the support beam and, on the other hand, with the operating tools by means of ropes, chains, levers, or the like.
  • the operating tools themselves may be centrifugally weighted and mounted in an axially displaceable manner on the trunnion and slide on a screw-like guide on a worm drive and the trunnion.
  • worm-like connections are provided in the worm drive and the trunnion which come into engagement with each other during the outward movement due to the centrifugal force.
  • the pressure forces which act on the tool impellers and the centrifugal forces may be used in combination.
  • the centrifugal devices which act directly on the operating tools may be used in such a way that the operating tools are suspended swingingly from the support beam on trunnions or eyelets.
  • the operating tools are either lawn aerating devices, that is, power rakes or scratching and cutting devices for the ground surface, or may have any other desirable shapes for lawn care devices.
  • the scratching devices be provided with cutting edges and also cutting tips.
  • the cutting edges may have a saw tooth shape, or may have a sickle like curvature, for example.
  • the receiving elements of one or a plurality of additional operating tools should be mounted behind the cutter or cutters of the cutter beams.
  • the additional operating tools may essentially be spring pins which act as power rakes or cutting knives and which are mounted on the centrifugal guide pieces or weights which are mounted on the support beam.
  • FIG. 1a is a perspective view of a support beam embodying the present invention having plate-like flanges for receiving the operating devices or tools;
  • FIG. 1b is a fragmentarily-illustrated plan view of an alternate embodiment of the support beam which is provided with an eyelet for attaching the operating tools;
  • FIG. 2 is a fragmentarily-illustrated perspective view of a further embodiment of the support beam having a trunnion-like flange with an operating tool supported thereon.
  • FIG. 3 is a perspective view of another embodiment of an operating tool
  • FIG. 4a is a side sectional view of a support beam with an operating tool in an non-operative position
  • FIG. 4b is a side sectional view similar to that of FIG. 4a, but showing the tool in an operative position;
  • FIG. 5 is a perspective view of one embodiment of a centrifugal guide of the operating tool with an associated centrifugal weight mounted on the cutter beam;
  • FIG. 6a is a side sectional view of the support beam with another embodiment of a centrifugal force guide coupled to a swinging operating tool and suspended from a support beam trunnion;
  • FIG. 6b is a top plan view of FIG. 6a
  • FIG. 6c is an elevational end view of FIG. 6a, further showing the lawn surface relative thereto;
  • FIG. 7 is a fragmentarily-illustrated perspective view of a support beam having an eyelet
  • FIG. 8 is a side sectional view of, in part elevation of, the lower part of the lawn mower.
  • FIG. 9 is a fragmentarily-illustrated perspective view of a further embodiment of the inventive device.
  • a support beam 10 made in accordance with the present invention which is symmetric and consists of a practically oscillation-free steel or plastic element of about 3 to 6 mm thickness.
  • Support beam 10 is provided with a central bore 11, two longitudinal bores and, adjacent to opposite longitudinal ends thereof, flange extensions 13 each of which, along with an adjacent portion of the support member 10, define a portion of a slot 12.
  • Over these plates 13, which may also be in the form of trunnions 17 (see FIG. 2), operating devices or work tools 15 and 16 (see FIG. 3) are selectively mounted depending on the operation to be performed and, as can be seen in FIG. 2, tools 16 are secured thereon by means of cotter or split pins 33 which are inserted in bores 14.
  • Operating tools 15, 16, shown in FIGS. 2-4b are provided with impellers 19 with which the operating tools are pivoted into the operating position (shown in FIG. 4b) when supporting beam 10 is rotated.
  • the direction of the wind pressure generated by the rotation of support beam 10 is indicated by arrows in front of impellers 19.
  • FIGS. 4a and 4b when cutting knife or tool 16, moving in the direction indicated by arrow A, hits an obstacle with its tip 32 or cutting edge 31, tool 16 can circumvent the obstacle by moving into an inoperative position as shown in FIG. 4a, for example, in that it pivots with its associated bushing 18 around trunnion 17.
  • the air again presses against the impeller of cutting tool 16 causing it to return to its operative position, as shown in FIG. 4b.
  • FIGS. 5-8 show examples of how the operating tools or devices are moved into the operative position due to the centrifugal forces generated by the rotation of support beam 10 (the centrifugal forces being indicated in the Figures by arrows F).
  • a centrifugal force guidance device 21 is provided which includes a rope or chain 25 which is connected to support beam 10 and operating tool 16.
  • Rope 25 supports a centrifugal weight 26 which pulls in direction F due to the centrifugal force and thereby pivots the operating device 16 into the operating position shown in FIG. 5.
  • the knife yields rearwardly by overcoming the centrifugal force.
  • Impeller 20 of FIG. 5 also acts as a throw out device for the material raked or cut off from the lawn.
  • Tool 16 is rotated by about 90°around trunnion 35 during movement thereof. Due to the specific weight distribution of the operating tool or device with a center of gravity below the pivot axis, the operating tool is pivoted into the shown operating position by means of the centrifugal force F when support beam 10 is rotated.
  • the operating tool cutting blade is deflected laterally. This deflection is favored by the wide curved cutting blade as seen best in FIG. 6c.
  • the tool is again pivoted into the normal position as shown in FIGS. 6a and 6b.
  • the centrifugal force guide device 35 in accordance with FIG. 7 shows an operating tool 16 which is held in a support eyelet 37 on support beam 10.
  • FIG. 7 shows that tool 16 swings freely to the outside due to the centrifugal force F.
  • operating tool 16 is pivoted rearwardly due to the grass resistance.
  • operating tool 16 has a greater ability to circumvent obstacles in a plurality of planes.
  • a support cutter or beam 38 is mounted on the lower part, that is, on the rotor or drive shaft 20 of a lawn mower motor with cutting blade portion 39 at its front edges and additional operating tools or devices, for example, power rakes 41 at its rear ends. With such a device the lawn can be simultaneously cut and aerated.
  • FIG. 9 shows a cutter beam with an arched throw-out edge.
  • a screw socket 40 is welded to cutter beam 38.
  • a support device 43 in the form of a screw is screwed into screw socket 40 for the power rake which in this embodiment is a spring pin 41 which is supported by a centrifugal force guide piece 42.
  • spring pin 41 is positioned parallel to the inside of cutter support beam 38. Due to the centrifugal force generated upon rotation of beam 38, the free end of the centrifugal force guide piece 42 is forced outwardly, whereby the spring pin 41 is pointed downward into the operating position toward the lawn.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)
  • Soil Working Implements (AREA)
US05/970,681 1977-12-24 1978-12-18 Lawn care device Expired - Lifetime US4306407A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2757963 1977-12-24
DE19772757963 DE2757963A1 (de) 1977-12-24 1977-12-24 Vorrichtung, insbesondere fuer die bearbeitung von rasenflaechen u.dgl.
DE7803395[U] 1978-02-06
DE7803395 1978-02-06

Publications (1)

Publication Number Publication Date
US4306407A true US4306407A (en) 1981-12-22

Family

ID=25773373

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/970,681 Expired - Lifetime US4306407A (en) 1977-12-24 1978-12-18 Lawn care device

Country Status (6)

Country Link
US (1) US4306407A (de)
AT (1) AT359763B (de)
CA (1) CA1103465A (de)
CH (1) CH637523A5 (de)
FR (1) FR2412243A1 (de)
GB (1) GB2011238B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409781A (en) * 1981-08-03 1983-10-18 Arnold Industries, Inc. Thatching tool for rotary lawn mower
US4559769A (en) * 1982-07-26 1985-12-24 Outboard Marine Corporation Cutter blade for pneumatically transporting grass clippings
US4610129A (en) * 1985-07-19 1986-09-09 Universal Industrial Products Co., A Div. Of Core Industries, Inc. Lawn mower blade with variable depth thatching device
USRE32377E (en) * 1982-07-26 1987-03-24 Outboard Marine Corporation Cutter blade for pneumatically transporting grass clippings
US4779407A (en) * 1986-11-21 1988-10-25 Pattee John G Rotatable member, replaceable components therefor, and methods of constructing and utilizing same
US4922697A (en) * 1989-08-14 1990-05-08 Paiva Anthony J Cutting attachment for rotary mower blades and use
US5233820A (en) * 1992-12-18 1993-08-10 Willsie Raymond W Lawnmower blade
US5600024A (en) * 1995-07-26 1997-02-04 Phillips Petroleum Company Enhanced recovery of alcohol from an ether containing stream
US5761892A (en) * 1996-02-26 1998-06-09 Quiroga; Osvaldo R. Rotary mower
EP0963692A1 (de) 1998-06-08 1999-12-15 Osvaldo R. Quiroga Rotormäher
US6038842A (en) * 1996-02-26 2000-03-21 Quiroga; Osvaldo R. Rotary mower apparatus
US20180177124A1 (en) * 2016-12-27 2018-06-28 Honda Motor Co., Ltd. Lawn mower
US11375659B2 (en) * 2016-12-27 2022-07-05 Honda Motor Co., Ltd. Lawnmower having a blade with adjustable flaps

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2178938A (en) * 1985-07-13 1987-02-25 Ian Sturmer Robinson Tractor front mounted pick-up hitch

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720071A (en) * 1953-02-09 1955-10-11 Watanabe Bunzo Power grass lifter and mower
US2740249A (en) * 1952-01-15 1956-04-03 Austin J Stearns Centrifugally operated rotary cutting element
US2869311A (en) * 1956-11-14 1959-01-20 Frontier Dev Company Blade for rotary lawn mower
US3086346A (en) * 1961-01-23 1963-04-23 William A Zimmermann Power mower safety device
US3117633A (en) * 1960-04-15 1964-01-14 Robert P Hosek Lawn treating machines
US3321026A (en) * 1964-12-07 1967-05-23 Albert L Hubbard Lawn renovator
US3742688A (en) * 1972-11-06 1973-07-03 H Tonjes Rake attachment for rotary mower
US3964243A (en) * 1975-03-10 1976-06-22 Rexnord Inc. Rotary mower blade with detachable tines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2740249A (en) * 1952-01-15 1956-04-03 Austin J Stearns Centrifugally operated rotary cutting element
US2720071A (en) * 1953-02-09 1955-10-11 Watanabe Bunzo Power grass lifter and mower
US2869311A (en) * 1956-11-14 1959-01-20 Frontier Dev Company Blade for rotary lawn mower
US3117633A (en) * 1960-04-15 1964-01-14 Robert P Hosek Lawn treating machines
US3086346A (en) * 1961-01-23 1963-04-23 William A Zimmermann Power mower safety device
US3321026A (en) * 1964-12-07 1967-05-23 Albert L Hubbard Lawn renovator
US3742688A (en) * 1972-11-06 1973-07-03 H Tonjes Rake attachment for rotary mower
US3964243A (en) * 1975-03-10 1976-06-22 Rexnord Inc. Rotary mower blade with detachable tines

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409781A (en) * 1981-08-03 1983-10-18 Arnold Industries, Inc. Thatching tool for rotary lawn mower
US4559769A (en) * 1982-07-26 1985-12-24 Outboard Marine Corporation Cutter blade for pneumatically transporting grass clippings
USRE32377E (en) * 1982-07-26 1987-03-24 Outboard Marine Corporation Cutter blade for pneumatically transporting grass clippings
US4610129A (en) * 1985-07-19 1986-09-09 Universal Industrial Products Co., A Div. Of Core Industries, Inc. Lawn mower blade with variable depth thatching device
US4779407A (en) * 1986-11-21 1988-10-25 Pattee John G Rotatable member, replaceable components therefor, and methods of constructing and utilizing same
US4922697A (en) * 1989-08-14 1990-05-08 Paiva Anthony J Cutting attachment for rotary mower blades and use
US5233820A (en) * 1992-12-18 1993-08-10 Willsie Raymond W Lawnmower blade
US5600024A (en) * 1995-07-26 1997-02-04 Phillips Petroleum Company Enhanced recovery of alcohol from an ether containing stream
US5761892A (en) * 1996-02-26 1998-06-09 Quiroga; Osvaldo R. Rotary mower
US6038842A (en) * 1996-02-26 2000-03-21 Quiroga; Osvaldo R. Rotary mower apparatus
EP0963692A1 (de) 1998-06-08 1999-12-15 Osvaldo R. Quiroga Rotormäher
US20180177124A1 (en) * 2016-12-27 2018-06-28 Honda Motor Co., Ltd. Lawn mower
US10813285B2 (en) * 2016-12-27 2020-10-27 Honda Motor Co., Ltd. Lawn mower
US11375659B2 (en) * 2016-12-27 2022-07-05 Honda Motor Co., Ltd. Lawnmower having a blade with adjustable flaps

Also Published As

Publication number Publication date
ATA929678A (de) 1980-04-15
FR2412243A1 (fr) 1979-07-20
AT359763B (de) 1980-11-25
CA1103465A (en) 1981-06-23
GB2011238A (en) 1979-07-11
GB2011238B (en) 1982-03-17
FR2412243B3 (de) 1981-10-02
CH637523A5 (de) 1983-08-15

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